如图,在直角坐标系内有等腰三角形OAB,O为原点,顶点A的坐标为(33,3),B的坐标为(6,0). (1)在坐标系中作△OAB关于y轴对称的图形△OA′B′; (2)将△OAB绕点O按顺时针方向旋转90
如图,在直角坐标系内有等腰三角形OAB,O为原点,顶点A的坐标为(3
,3),B的坐标为(6,0).
(1)在坐标系中作△OAB关于y轴对称的图形△OA′B′;
(2)将△OAB绕点O按顺时针方向旋转90°得△OCD.画出△OCD,并写出点C的坐标;
(3)猜测∠AOB的度数,并说明理由.
3 |
(1)在坐标系中作△OAB关于y轴对称的图形△OA′B′;
(2)将△OAB绕点O按顺时针方向旋转90°得△OCD.画出△OCD,并写出点C的坐标;
(3)猜测∠AOB的度数,并说明理由.
数学人气:156 ℃时间:2019-10-19 04:51:45
优质解答
(1)图形△OA′B′正确(2分)(2)画出△OCD正确(4分);点C(3,-33)(5分)(3)猜测∠AOB的度数为30°(6分)理由:过A作AE⊥x轴于E,取AO中点为F,连接EF,则可知Rt△AEO中,∵等腰三角形OAB,OB=OA=6,∴斜...
我来回答
类似推荐
猜你喜欢
- 1已知m2-mn=21,mn-n2=-12.求下列代数式的值: (1)m2-n2 (2)m2-2mn+n2.
- 2He is 1.76 meters in height./ The church tower is 20 meters high.请问height和high有什么区别?
- 3有一水池装有进水管和排水管,单开进水管12小时可以注满一池水,如果同时开放两管,8小时只能注满水池的1/3,问单开排水管,几小时可以把半池水排完?
- 4They are going to leave next Tuesday 如何对next Tuesday提问
- 5She told the children that they ___________________ (can) come to her house and ___________________ (play) with the dog
- 6()1.—What___Nancy and Amy have?—They___some fruit. A.do;have B.does;has C.does;have
- 7太阳一年直射地球几次,我知道太阳一直都在直射地球
- 8实施科教兴国战略的根本途径是
- 9已知数列{an}的前N项和为Sn 且an+1=Sn-n+3,a1=2,设Bn=n/Sn-n+2前N项和为Tn 求证Tn 小于4/3
- 10It takes ten minutes to ride to school.(同义句) It takes ten _____ _____ _____ get to school.